DateTimeconversion fix

[GoogleCodeExporter]

Purpose of code changes:
Fixed Time after midday conversion and updated unit-tests


When reviewing my code changes, please focus on: SoqlUtilsTest changes
Not sure if it's consistent as your tests are usually slightly different.
I would prefer randomization here because without it need to test 4 test cases 
- before midday, after midday, midday and midnight, because midnight time and 
after midday time are converted another way now.

Original issue reported on code.google.com by [email protected] on 16 Apr 2013 at 10:50